Fixes array indexing but may transpose figures

[quantumsteve]

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Proposed changes

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Fixes #675

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Does this introduce a breaking change?

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[mkstoyanov]

@quantumsteve The BiCG is higher priority but if we're not going to get back to this one, then we should close it.

[quantumsteve]

Closing as the matlab interface is likely to be deprecated/removed and distributed gmres/bicgstab is a higher priority.